Error(s) in re-building vignettes:
--- re-building ‘ddid2.Rmd’ using rmarkdown
Warning in panelize.data(data, idname, tname, t, tmin1) :
  dropping 2675 observations that are not in period: 1978, 1975, ...
Warning in panel.checks(qp) :
  covariates appear to vary over time...
  only conditioning on first period covariates...
  this is recommended practice, but worth noting...
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'ddid2.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘ddid2.Rmd’

--- re-building ‘panel-qtet.Rmd’ using rmarkdown
Warning in panel.checks(qp) :
  covariates appear to vary over time...
  only conditioning on first period covariates...
  this is recommended practice, but worth noting...
Warning in panel.checks(qp) :
  covariates appear to vary over time...
  only conditioning on first period covariates...
  this is recommended practice, but worth noting...
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
Warning in rq.fit.br(x, y, tau = tau, ...) : Solution may be nonunique
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'panel-qtet.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘panel-qtet.Rmd’

--- re-building ‘R-QTEsWrapper.Rnw’ using Sweave
--- finished re-building ‘R-QTEsWrapper.Rnw’

SUMMARY: processing the following files failed:
  ‘ddid2.Rmd’ ‘panel-qtet.Rmd’

Error: Vignette re-building failed.
Execution halted